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An unknown radioactive element decays into non-radioactive substances. In 140 days the radioactivity of a sample decreases by31 percent. (a) What is the half-life of

An unknown radioactive element decays into non-radioactive substances. In140 days the radioactivity of a sample decreases by31 percent.

(a)What is the half-life of the element?______________

(b)How long will it take for a sample of 100 mg to decay to 8 mg?___________________

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